Make Gyro Meat: Add onion and garlic to a food processor and very finely chop. Add to a bowl along with the ground meat, salt, pepper, bread crumbs, oregano, cumin, and Aleppo pepper. Use clean hands to mix and mash the meat together really well.

Bake: Press meat mixture into a 9x5 inch loaf pan. Bake at 325 degrees F for about 50-60 minutes, or until the center registers 165 degrees on a thermometer. Set aside to rest for 20 minutes, and then refrigerate for a few hours or overnight.

Slice Meat: Remove meat from pan and cut into thin strips, about 1/8 inch thick.

Brown meat: Heat a griddle or skillet over medium high heat. Add some of the meat drippings or a little oil to lightly coat the bottom of the pan. Once hot, lay the meat slices flat in the pan and cook for just 1-2 minutes on each side, until browned and crisp.

Assemble Gyros: Serve gyro meat in a warm pita, topped with tomato, onion, lettuce, tzatziki, and feta.